Nut-lock.



vbut showing the relative positions of the -ing disk or washer 1,which is concavo-.con-

UNITED STATES PATENT OFFICE.

ORLANDOi CRITTENDEN, OF ASHLAND, OHIO.

NUT-LOCK.

Application led ctober 9,

.To all whom it may concern.'

Be it known that I, ORLANDO ORiTTnNnEN, a citizen of the United States, residing at Ashland, in the county of Ashland and State of Ohio, have invented a new and useful Nut- Lock, of which the fllowing is a specification.

bThis invention'relates to nut-locks and its object is to'provide a device of this character in which a washer is utilized both for gri ping the bolt and retaining a nut upon tie' Another object is to provide a washer designed to be screwed upon the bolt and to be clamped between'nuts upon the bolt, such clam )ing action causing the washer to frictiona ly engage the bolt and thus prevent independent rotation of the bolt and washer and also prevent the clamping nuts from being accidentally detached from the bolt.

A further object is-to rovide a locking washer of this type which las its bolt-engaging faces so formed as to cut into the thread of the bolt should an effort be made to rotate the washer independently of the bolt.

With these and other objects in view the invention consists of certain novel details of construction and combinations of parts hereinafter more fully described and pointed out in the claims.

In the accompanying drawings the preferred form of the invention has been shown. l

In `said drawings :-Figure 1 is a section throu' h the locking washer and the nuts arran e upon a bolt, said parts being shown in t e'positions occupied by them prior to the clamping of the washer. Fig. 2 is a view similar to Fig. 1, showing the washer clam ed between the nuts and engaging the bolt. iig. 3 is a face view of the washer in its normal position, the bolt being shown in section therein. Fig. 4 is a view similar to Fig. 3,

washer and bolt when the said washer is clamped between two objects.

Referring to the figures by characters of reference A designates a bolt on which are threaded nuts B and C. rThreaded on the bolt between these two nuts is a lockvexas indicated in Fig'. 1, and is provided with a central opening 2, the wall of which is screw-threaded so as to engage the thread on the bolt A. That portion of the disk surrounding the opening 2 is thickened as indicated at 3 so t at a threaded surface of Specification of Letters Patent.

Patented March 30, 1909.

1908. Serial No. 456,944.

increased area may be roduced around the Moreover t is thickened portion 3 constitutesa sto or abutment as will be hereinafter set fort 1. A number of slots 4 are arranged radially within the disk 1, said slots extending from the central opening 2 toward the margin of the disk. These slots intersect the threads within the opening 2 and are enlarged at their outer ends as indicated at 5, while the walls ofthe slots diverge inwardly at their inner ends as indicated at 6 so as to produce biting edges 7 for the purpose hereinafter set forth.

Vfhcn it is desired to use ythe device here described the nut B is first screwed on the bolt A until it is brought against the object to be secured and the disk l. is then also screwed onto the bolt until its convex face is brought against the nut B, The nut C is then also screwed onto the bolt and against the other face of the disk. By ti htening this nut C the disk 1 will be tig tly clamped between the two nuts and will flatten out to a limited extent, as indicated in Fig. 2, this resulting in the tongues 8, which are formed between the slots 4, pressing in-4 wardly against the bolt A and frictionally engaging it to such an extent as to positively prevent independent rotation of the bolt and disk. By providin the central thickened portion Y3 the nut will be caused to bear there-against after the disk has been clam ed opening 2.

to a sufllcient extent, and the disk is t us herein described isto be formed of tem- -pered steel or other suitable hard, resilient material.-

Of course various changes niaY be made in the size and proportions of the ock without departing from the spirit or sacriiicing the advantages of the invention.

What is claimed is 1. A nut lock comprising a concave-convex disk vhaving a. central apertured thickened portion, there being threads within the aperture, said disk `being, provided with traction of tlie washer has been reached.

2. The combination with a bolt and a xed and a movable clamping member thereon, of a nut lock upon the bolt and interposed between said members, said lock comprising a concave-convex disk having a central thickened apertured `portion screw-threaded and engaging the bolt, said thread being intersected by radial slots formed within the disk, there being tongues between the slots, the peripheral portion of the washer constituting a bearing for the movable clamping member and being shiftable by said member to move the tongues together and upon the bolt to clamp the bolt, said inner ends of the tongues constituting means for limiting the movement of the movable clamping member.

3. The combination with a bolt and a ixed and a movable clamping member thereon, of a nut lock upon the bolt and interposed between said members, said lock comprising a concavo-convex disk having a central thickened apertured ortion screwthreaded and engaging the bo t, said thread being intersected by radial slots formed within the disk, there being tongues between the slots, the peripheral portion of the washer constituting a bearing for the movabley clamping member and being shiftable by said member to move the tongues together and upon the bolt to clamp the bolt, said inner ends of the tongues constituting means for limiting the movement of the movable clamping member, the inner ends of the walls of the slots within the Washer diverging inwardly to form biting edges for engagement with the bolt when the washer is contracted. In testimony that I claim the foregoing as my own, I have hereto alixed my signature in the presence of two witnesses.

ORLANDO CRITTENDEN. Witnesses JAs. M. WALKER, HERBERT D. LAWSON. 

